Unfortunately, you can't. At the moment they're only available in the arena on game days. I'm keeping a look out as well, but seeing as they are not made by Lutch (like all other KHL jerseys to my knowledge), who's jerseys can be ordered online, they'll no doubt be harder to find.

You can buy some "fan" t-shirts and jerseys at their website, but as far as I know the jerseys themselves aren't available yet. I'm sure they'll be out some time soon, as there definitely are people out there who would buy them